Energy and exergy analysis of a diesel engine fuelled with diesel and biodiesel fuels at various engine speeds

ABSTRACT Energy and exergy analysis of internal combustion engines is a key issue to find out an alternative fuel to conventional diesel fuel since the analyses are indicators of quantity and quality of energy resources. In the present study, exergy and energy analyses of a diesel engine were evaluated when the engine was fuelled with conventional diesel, hazelnut biodiesel, and canola biodiesel fuels. The results of the study depicted that fuel energy conversion to output power and exergy work rate decreased with biodiesel usage in all engine speed. The highest value of thermal efficiency and exergy efficiency were obtained at 1800 rpm for conventional diesel, hazelnut biodiesel, and canola biodiesel fuels. Analyses showed that the lowest destruction occurred at 1800 rpm for all test fuels with the value of 45.45%, 47.36%, and 47.41% for diesel, hazelnut biodiesel, and canola biodiesel, respectively. Furthermore, the entropy generation rate was the minimum at 1800 rpm engine speed for all test fuels.

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